A problem is that smartphone camera sensors just aren't good at picking up colors exactly. White balance seriously affects the result, e.g. right now it's showi

A problem is that smartphone camera sensors just aren't good at picking up colors exactly. White balance seriously affects the result, e.g. right now it's showing a white sheet of paper as "faint orange" (outside with overcast sky, i.e ideal lighting). And with dark colors, the result is strongly affected by noise, especially for short exposure times. Maybe the results could be improved by using raw sensor data and longer exposure times?